Script to create a templates PR for a repo

templates

#!/usr/bin/env ruby

require 'fileutils'

# Use: atom-templates [repo_name]
#
# 1. Clone the repository if it doesn't already exist; fetch `master` if it does
# 2. Clean up old `template-update` branch if it exists
# 3. Check out new branch `template-update` based on `origin/master`
# 4. Copy template files over
# 5. If there have been changes commit them, push the branch and open the repo in a browser window

BRANCH_NAME = 'template-update'
REPO_HOME = File.expand_path(ENV['ATOM_REPOS_HOME']) || File.expand_path('../..', File.dirname(__FILE__))
TRIAGE_HOME = File.expand_path('..', File.dirname(__FILE__))

def clone(name)
  git("clone git@github.com:atom/#{name}.git #{File.join(REPO_HOME, name)}")
end

def current_branch
  `git rev-parse --abbrev-ref HEAD`.strip
end

def git(command, options = {})
  puts "git #{command}"
  result = system("git #{command}")

  unless result || options[:ignore_failures]
    raise StandardError, "Git command 'git #{command}' failed with error code #{$?}"
  end
end

def repo_exists?(name)
  repo_dir = File.join(REPO_HOME, name)
  git_dir = File.join(repo_dir, '.git')

  Dir.exist?(repo_dir) && Dir.exist?(git_dir)
end

def working_tree_clean?
  system('git diff-index --quiet HEAD --')
end

repo_name = ARGV[0]
repo_dir = File.join(REPO_HOME, repo_name)

if repo_exists?(repo_name)
  Dir.chdir(repo_dir) do
    git('fetch origin master')
  end
else
  clone(repo_name)
end

Dir.chdir(repo_dir) do
  git('checkout master') if current_branch == BRANCH_NAME

  git("branch -df #{BRANCH_NAME}", ignore_failures: true)
  git("checkout -b #{BRANCH_NAME} origin/master")

  FileUtils.cp(File.join(TRIAGE_HOME, 'issue-template.md'), File.join(repo_dir, 'ISSUE_TEMPLATE.md'))

  if repo_name == 'atom'
    FileUtils.cp(File.join(TRIAGE_HOME, 'pull-request-template-atom.md'), File.join(repo_dir, 'PULL_REQUEST_TEMPLATE.md'))
  else
    FileUtils.cp(File.join(TRIAGE_HOME, 'pull-request-template.md'), File.join(repo_dir, 'PULL_REQUEST_TEMPLATE.md'))
  end

  if working_tree_clean?
    puts
    puts('No changes')
  else
    git('add ISSUE_TEMPLATE.md PULL_REQUEST_TEMPLATE.md')
    git('commit -m ":memo: Update issue and PR templates"')
    git("push -u origin #{BRANCH_NAME}")
    system("open https://github.com/atom/#{repo_name}")
  end
end